Bendable transparent films from cellulose nanocrystals–Study of surface and microstructure-property relationship

Hannah Tideland; Jelka Feldhusen; Amit Kumar Sonker; Gunnar Westman

doi:10.1016/j.carpta.2023.100367

Bendable transparent films from cellulose nanocrystals–Study of surface and microstructure-property relationship

Hannah Tideland, Jelka Feldhusen, Amit Kumar Sonker^*, Gunnar Westman^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

2 Citations (Scopus)

Abstract

The presented work focuses on preparing transparent bendable films from nanocellulose. In comparison to cellulose nanofibrils and bacterial cellulose, nanocrystalline cellulose are shorter and have higher crystallinity (CI<95 %). Sulfated CNC (CNCIH-OSO3H) were prepared, and by changing their counter ions from H+ to Na+ and Et4N+ (Tetraethyl ammonium) flexible films were prepared with a strength of 70.5 MPa and 2.6 % elongation at break. The CNC suspensions showed excellent dispersibility in DI water with Zeta-potential (ζ) values > -35 mV. In the preparation of films, pre-sonication was key in improving the tensile strength and improved elongation (>30 % increase compared to films prepared without sonication) and hydrophobicity. The change of counter ion, H+ to Na+ or Et4N+, improved the thermal and mechanical properties of CNC films. The films were investigated with UV–Vis spectroscopy and optical polarized spectroscopy to explain the arrangement of nanocellulose crystals in correlation with the mechanical properties. The wettability of CNC samples was also studied and explained in detail. CNC from CelluForce was also studied as commercial reference samples. The modified CNC films have adequate properties for application in flexible electronics, energy storage, and biodegradable smart packaging.

Original language	English
Article number	100367
Journal	Carbohydrate Polymer Technologies and Applications
Volume	6
DOIs	https://doi.org/10.1016/j.carpta.2023.100367
Publication status	Published - Dec 2023
MoE publication type	A1 Journal article-refereed

Funding

AKS and GW thank Wallenberg Wood Science Center (WWSC) for financial support.

Keywords

Colloids and suspensions
Films
Nanocellulose
Physiochemical properties
Sonication

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title = "Bendable transparent films from cellulose nanocrystals–Study of surface and microstructure-property relationship",

abstract = "The presented work focuses on preparing transparent bendable films from nanocellulose. In comparison to cellulose nanofibrils and bacterial cellulose, nanocrystalline cellulose are shorter and have higher crystallinity (CI<95 \%). Sulfated CNC (CNCIH-OSO3H) were prepared, and by changing their counter ions from H+ to Na+ and Et4N+ (Tetraethyl ammonium) flexible films were prepared with a strength of 70.5 MPa and 2.6 \% elongation at break. The CNC suspensions showed excellent dispersibility in DI water with Zeta-potential (ζ) values > -35 mV. In the preparation of films, pre-sonication was key in improving the tensile strength and improved elongation (>30 \% increase compared to films prepared without sonication) and hydrophobicity. The change of counter ion, H+ to Na+ or Et4N+, improved the thermal and mechanical properties of CNC films. The films were investigated with UV–Vis spectroscopy and optical polarized spectroscopy to explain the arrangement of nanocellulose crystals in correlation with the mechanical properties. The wettability of CNC samples was also studied and explained in detail. CNC from CelluForce was also studied as commercial reference samples. The modified CNC films have adequate properties for application in flexible electronics, energy storage, and biodegradable smart packaging.",

keywords = "Colloids and suspensions, Films, Nanocellulose, Physiochemical properties, Sonication",

author = "Hannah Tideland and Jelka Feldhusen and Sonker, \{Amit Kumar\} and Gunnar Westman",

note = "Publisher Copyright: {\textcopyright} 2023 The Author(s)",

year = "2023",

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doi = "10.1016/j.carpta.2023.100367",

language = "English",

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AU - Tideland, Hannah

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AU - Sonker, Amit Kumar

AU - Westman, Gunnar

PY - 2023/12

Y1 - 2023/12

N2 - The presented work focuses on preparing transparent bendable films from nanocellulose. In comparison to cellulose nanofibrils and bacterial cellulose, nanocrystalline cellulose are shorter and have higher crystallinity (CI<95 %). Sulfated CNC (CNCIH-OSO3H) were prepared, and by changing their counter ions from H+ to Na+ and Et4N+ (Tetraethyl ammonium) flexible films were prepared with a strength of 70.5 MPa and 2.6 % elongation at break. The CNC suspensions showed excellent dispersibility in DI water with Zeta-potential (ζ) values > -35 mV. In the preparation of films, pre-sonication was key in improving the tensile strength and improved elongation (>30 % increase compared to films prepared without sonication) and hydrophobicity. The change of counter ion, H+ to Na+ or Et4N+, improved the thermal and mechanical properties of CNC films. The films were investigated with UV–Vis spectroscopy and optical polarized spectroscopy to explain the arrangement of nanocellulose crystals in correlation with the mechanical properties. The wettability of CNC samples was also studied and explained in detail. CNC from CelluForce was also studied as commercial reference samples. The modified CNC films have adequate properties for application in flexible electronics, energy storage, and biodegradable smart packaging.

AB - The presented work focuses on preparing transparent bendable films from nanocellulose. In comparison to cellulose nanofibrils and bacterial cellulose, nanocrystalline cellulose are shorter and have higher crystallinity (CI<95 %). Sulfated CNC (CNCIH-OSO3H) were prepared, and by changing their counter ions from H+ to Na+ and Et4N+ (Tetraethyl ammonium) flexible films were prepared with a strength of 70.5 MPa and 2.6 % elongation at break. The CNC suspensions showed excellent dispersibility in DI water with Zeta-potential (ζ) values > -35 mV. In the preparation of films, pre-sonication was key in improving the tensile strength and improved elongation (>30 % increase compared to films prepared without sonication) and hydrophobicity. The change of counter ion, H+ to Na+ or Et4N+, improved the thermal and mechanical properties of CNC films. The films were investigated with UV–Vis spectroscopy and optical polarized spectroscopy to explain the arrangement of nanocellulose crystals in correlation with the mechanical properties. The wettability of CNC samples was also studied and explained in detail. CNC from CelluForce was also studied as commercial reference samples. The modified CNC films have adequate properties for application in flexible electronics, energy storage, and biodegradable smart packaging.

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KW - Physiochemical properties

KW - Sonication

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Bendable transparent films from cellulose nanocrystals–Study of surface and microstructure-property relationship

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Keywords

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